Single-acting pneumatic actuator with super large torque

Abstract

This invention belongs to the technical field of pneumatic actuators, specifically relating to a single-acting pneumatic actuator with ultra-high torque. It includes a spring module, a cylinder module, and a housing module. The housing module includes a housing and a shift fork. Two guide rods are symmetrically fixed inside the housing, and a guide block is slidably connected to each guide rod via an oil-free bearing. This invention can both increase output torque and allow for a relatively small size of individual spring modules. It achieves a large thrust design with small-sized springs, meeting the requirements of ultra-high torque actuators, and also allows for better conversion of spring compression force into thrust, resulting in high conversion efficiency and a comprehensive improvement in output torque. Furthermore, this invention allows for flexible adjustment of the number of spring modules used according to different loads, thereby reducing usage and extending overall lifespan. Simultaneously, it can quickly detect abnormal spring deformation locations, facilitating timely maintenance and preventing load control failures.

Description

Technical Field

[0001] The present invention belongs to the technical field of pneumatic actuating devices, and particularly relates to a single-acting pneumatic actuator with an ultra-large torque. Background Art

[0002] Existing single-acting pneumatic fork actuators are all driven by the thrust generated when the spring is compressed and reset. After the spring is compressed, a linear spring reset force is generated, which acts on the spring seat and the spring rod, and drives the fork to rotate through the transmission pin to generate torque, thereby driving the load.

[0003] As the diameters of industrial pipelines and pipeline valves are increasing day by day, the demand for large-torque actuators supporting rotary valves is also increasing. Since single-acting actuators all rely on spring drive, the demand for the thrust of the spring module is also increasing. The greater the thrust, the larger the spring required. Currently, the inner diameter of 550 mm of the spring is the general manufacturing limit of spring factories. This makes it very difficult to design and manufacture a single-acting pneumatic fork actuator with a torque exceeding 250,000 N·m. For large-diameter cryogenic butterfly valves in the LNG industry, the demand for the torque of single-acting actuators even exceeds 500,000 N·m. The existing spring and spring module solutions are not feasible. At the same time, since pneumatic actuating devices are installed on other devices, there are certain restrictions on the volume. If a spring with too large a volume is installed, it is not conducive to installation and daily production maintenance; moreover, due to the existence of compressive circumferential torque after the spring is compressed, there will be a certain pressure loss and it cannot be efficiently converted into thrust subsequently; in addition, since the spring is a consumable part, how to improve the service life of the spring is the research focus; and the spring will deform abnormally after being used for a long time. For a pneumatic actuator with multiple springs, it is impossible to quickly determine which spring is abnormal, resulting in low maintenance and replacement efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a single-acting pneumatic actuator with ultra-high torque. Through a bidirectional fork control structure, this invention enhances output torque while maintaining a relatively small size for individual spring modules. This avoids the problems of excessively large spring modules, which would hinder installation, and also prevent the imposition of excessively high performance requirements that would make manufacturing impossible. The spring module design achieves high thrust with small springs, meeting the requirements of ultra-high torque actuators, and effectively eliminates the compression torque between multiple springs. This allows for better conversion of spring compression force into thrust, resulting in high conversion efficiency and a comprehensive improvement in output torque. Furthermore, the combination of spring modules and an adjustment mechanism allows for flexible adjustment of the number of spring modules used according to different loads, reducing usage and extending overall lifespan. Simultaneously, it enables rapid assessment of the spring module status, quickly identifying abnormal spring deformation locations for timely maintenance and preventing load control failures.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A single-acting pneumatic actuator with ultra-high torque includes a spring module, a cylinder module, and a housing module. The housing module includes a housing and a shift fork. Two guide rods are symmetrically fixed inside the housing, and a guide block is slidably connected to each guide rod via an oil-free bearing. A drive pin is rotatably connected to each guide block via an oil-free bearing. A push groove is symmetrically through the shift fork, and the drive pin is located inside the push groove. An external load is connected to the middle of the shift fork. Both guide blocks are connected to piston rods, one end of which is fixedly connected to the piston of the cylinder module. The two cylinder modules are located on opposite sides of the housing module. A spring module is fixedly connected to the piston of the cylinder module for resetting.

[0006] Furthermore, the spring module includes a spring cylinder, one end of which is detachably fitted with an end cap; four guide tubes are evenly arranged circumferentially inside the spring cylinder; one end of each guide tube is fixedly connected to the end cap; multiple spring modules are fitted onto the guide tubes; spring modules away from the end cap are fixedly connected to spring seats, and the spring seats are fixedly connected to the piston of the cylinder module.

[0007] Furthermore, the spring module includes a spring spacer that is slidably connected to the inner wall of the spring cylinder; a first sliding hole is provided through the spring spacer, and the first sliding hole is slidably connected to the guide tube; springs are fixedly connected to both ends of the first sliding hole, and the two springs have opposite directions of rotation; the adjacent springs on the same side of the spring spacer have opposite directions of rotation; all springs are sleeved on the guide tube; the springs at the near ends of adjacent spring modules have opposite directions of rotation.

[0008] Furthermore, an adjustment mechanism is provided between adjacent spring modules. The adjustment mechanism includes an adjustment disc with a second sliding hole that is slidably connected to a guide tube. The two ends of the second sliding hole are respectively fixedly connected to the corresponding springs. A T-shaped arc groove is provided on the side wall of the adjustment disc, and a T-shaped block is slidably connected to the T-shaped arc groove.

[0009] Furthermore, the side wall of the spring cylinder has an axial groove and multiple circumferential grooves; the axial groove and the middle of the circumferential grooves are fixedly connected; when the spring is not under force, the T-block is located on the circumferential groove.

[0010] Furthermore, the spring seat has a third sliding hole, which is slidably connected to the guide tube; the spring seat has a through hole in the middle, and a connector is inserted into the through hole, with the other end of the connector locked to the spring seat by a nut; the connector has a threaded groove and is threadedly connected to the piston rod of the cylinder module.

[0011] Furthermore, the piston is connected to the piston rod via a dividing ring; two O-rings are provided on the side wall of the piston for sealing the piston and the cylinder; a guide ring is fixedly provided on the side wall of the piston to guide the piston's movement relative to the cylinder; an oil reservoir is provided on the side wall of the piston between the two O-rings; and a second guide ring is fixedly provided on the inner wall of the third sliding hole.

[0012] Furthermore, the cylinder connecting cover and the flange at one end of the cylinder are connected by screws, and the flange at the other end of the cylinder and the spring sleeve are connected by screws; two second O-rings are provided between the piston rod and the cylinder connecting cover for sealing; a second oilless bearing is used to guide the piston rod and the cylinder connecting cover; a second oil reservoir is also provided on the inner ring wall of the cylinder connecting cover between the two second O-rings.

[0013] Furthermore, a second through hole is provided on the cylinder connecting cover, and a second nut is fixed in the second through hole. A limit screw is screwed onto the second nut to limit the piston stroke; a washer and a third O-ring are fixed to one end of the second nut.

[0014] Furthermore, a third guide ring is provided inside the first sliding hole; a pressure cap is fixedly connected to one end of the spring cylinder away from the end cover via a positioning ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses a two-way shift fork control structure design, with the left and right modules providing thrust at the same time, which can obtain double thrust. At the same time, the symmetrical structure design enables the left and right cylinder spring modules of the housing to be balanced and the force is fully utilized. This can not only increase the output torque, but also make the size of a single spring module relatively small, avoiding the problem that the spring module is too large, which would make it difficult to install, and also avoids the problem that the performance requirements of the spring module are too high, which would make it impossible to manufacture.

[0016] (2) Through the structural design of the spring module, the present invention can achieve a large thrust design with a small spring, meet the requirements of ultra-high torque actuators, and effectively eliminate the compression circumferential torque between multiple springs, so that the compression force of the spring can be better converted into thrust, with high conversion efficiency and comprehensive improvement of output torque. Specifically, through the structural design of the spring module, the spring module becomes a unit. Due to the parallel connection of springs inside a single spring module and the combination of multiple spring modules in series, a small spring can also achieve a large thrust design, meeting the requirements of ultra-high torque actuators. At the same time, by utilizing the structural design of the springs on the same side of the spring spacer of the spring module with opposite rotation directions and the springs at both ends of the spring spacer with opposite rotation directions, the compression circumferential torque between the axial end faces of the spring module and the compression circumferential torque between adjacent springs in the circumferential direction cancel each other out, effectively eliminating the compression circumferential torque between multiple springs, so that the compression force of the spring can be better converted into thrust, with high conversion efficiency and comprehensive improvement of output torque.

[0017] (3) This invention, through the structural cooperation of the spring module and the adjustment mechanism, can flexibly adjust the number of spring modules used according to different loads, thereby reducing usage and increasing overall lifespan. At the same time, it can quickly determine the status of the spring module and quickly detect abnormal deformation of the spring, thus facilitating timely maintenance and avoiding load control failure. Specifically, since multiple spring modules are connected in series, the magnitude of the controllable torque is related to the number of modules connected in series. When the spring is not under force, the T-block is located on the circumferential groove. Since the T-block slides in the T-shaped arc groove, the corresponding T-block can be selectively slid to the appropriate position according to the different load sizes. The edge of the circumferential groove limits the adjustment disc; thus, during load control, only the spring module between the adjustment disc and the cylinder module is compressed, which satisfies the spring requirements of different loads while allowing some spring modules to remain uncompressed and in standby mode. This reduces the use of some spring modules, thereby improving the overall lifespan. Furthermore, when some spring modules deform abnormally, their uncompressed length changes, preventing the corresponding T-block from being positioned on the circumferential groove. This allows for quick assessment of the spring module's condition and rapid detection of abnormal deformation, facilitating timely repairs and preventing load control failures. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a single-acting pneumatic actuator with ultra-high torque according to the present invention. Figure 2 This is a schematic diagram of the housing module structure of a single-acting pneumatic actuator with ultra-high torque according to the present invention; Figure 3 This is a schematic diagram of the spring module structure of a single-acting pneumatic actuator with ultra-high torque according to the present invention; Figure 4 This is a schematic diagram of the spring cylinder structure of a single-acting pneumatic actuator with ultra-high torque according to the present invention; Figure 5 This is a schematic diagram of the spring cylinder and spring dispersion structure of a single-acting pneumatic actuator with ultra-high torque according to the present invention. Figure 6 This is a schematic diagram of the spring and adjusting disc distributed structure of a single-acting pneumatic actuator with ultra-high torque according to the present invention.

[0019] The attached figures are labeled as follows: Housing-1, Shift Fork-2, Transmission Pin-3, Guide Block-4, Guide Rod-5, Piston Rod-6, Cylinder Connecting Cover-7, Cylinder-8, Piston-9, Dividing Ring-10, Spring Cylinder-11, Spring Seat-12, Nut-13, Connector-14, Spring-15, Spring Spacer-16, Guide Tube-17, Third Guide Ring-18, Positioning Ring-19, Pressure Cap-20, Second Guide Ring-21, Guide Ring-22, O O-ring-23, oil reservoir-24, second O-ring-25, second oil-free bearing-26, second oil reservoir-27, second nut-28, limit screw-29, third O-ring-30, gasket-31, adjusting plate-33, end cap-111, axial groove-112, circumferential groove-113, third sliding hole-121, first sliding hole-161, second sliding hole-331, T-shaped arc groove-332, T-block-333. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0022] Example like Figures 1-6 As shown, a single-acting pneumatic actuator with ultra-high torque includes a spring module, a cylinder module, and a housing module. The housing module includes a housing 1 and a shift fork 2. Two guide rods 5 are symmetrically fixed inside the housing 1. A guide block 4 is slidably connected to each guide rod 5 via an oil-free bearing. A transmission pin 3 is rotatably connected to the guide block 4 via an oil-free bearing. A push groove is symmetrically through the shift fork 2, and the transmission pin 3 is located inside the push groove. An external load is connected to the middle of the shift fork 2. Both guide blocks 4 are connected to piston rods 6. One end of the piston rod 6 is fixedly connected to the piston 9 of the cylinder module. The two cylinder modules are located on both sides of the housing module. A spring module is fixedly connected to the piston 9 of the cylinder module for resetting.

[0023] This invention utilizes a bidirectional shift fork 2 control structure design, where the left and right modules simultaneously provide thrust, achieving double the thrust. The symmetrical structure design ensures balanced setting of the left and right cylinder spring modules, maximizing force utilization. This not only increases output torque but also allows for a relatively small size for individual spring modules, avoiding the problems of excessively large spring modules that would hinder installation or require excessively high performance specifications that would prevent manufacturing.

[0024] Furthermore, the spring module includes a spring cylinder 11, one end of which is detachably fitted with an end cap 111; four guide tubes 17 are evenly arranged circumferentially inside the spring cylinder 11; one end of the guide tube 17 is fixedly connected to the end cap 111; multiple spring modules are sleeved on the guide tube 17; spring modules away from the end cap 111 are fixedly connected to spring seats 12, and the spring seats 12 are fixedly connected to the piston 9 of the cylinder module.

[0025] This invention, through the structural design of the spring module, can achieve a large thrust design with a small spring 15, meeting the requirements of ultra-high torque actuators, and can also effectively eliminate the compression circumferential torque between multiple springs 15, thereby better converting the compression force of the spring 15 into thrust, with high conversion efficiency and comprehensive improvement of output torque; a detailed description will follow.

[0026] Furthermore, the spring module includes a spring spacer 16 that is slidably connected to the inner wall of the spring cylinder 11; a first sliding hole 161 is provided through the spring spacer 16, and the first sliding hole 161 is slidably connected to the guide tube 17; springs 15 are fixedly connected to both ends of the first sliding hole 161, and the two springs 15 have opposite directions of rotation; adjacent springs 15 on the same side of the spring spacer 16 have opposite directions of rotation; all springs 15 are sleeved on the guide tube 17; the springs 15 at the near ends of adjacent spring modules have opposite directions of rotation.

[0027] This invention utilizes the structural design of the spring module to make the spring module a single unit. Due to the parallel connection of springs 15 within a single spring module and the combination of multiple spring modules in series, even small-sized springs 15 can achieve a large thrust design, meeting the requirements of ultra-high torque actuators. Simultaneously, by employing the structural design of opposite rotation directions of adjacent springs 15 on the same side of the spring spacer 16 of the spring module, and opposite rotation directions of springs 15 at both ends of the spring spacer 16, the compression circumferential torque between the axial end faces of the spring module and the compression circumferential torque between adjacent springs 15 in the circumferential direction cancel each other out, effectively eliminating the compression circumferential torque between multiple springs 15. This allows the compression force of the springs 15 to be better converted into thrust, resulting in high conversion efficiency and a comprehensive improvement in output torque.

[0028] Furthermore, an adjustment mechanism is provided between adjacent spring modules. The adjustment mechanism includes an adjustment disk 33, on which a second sliding hole 331 is provided. The second sliding hole 331 is slidably connected to the guide tube 17. The two ends of the second sliding hole 331 are respectively fixedly connected to the corresponding spring 15. A T-shaped arc groove 332 is provided on the side wall of the adjustment disk 33, and a T-shaped block 333 is slidably connected to the T-shaped arc groove 332.

[0029] This invention, through the structural cooperation of the spring module and the adjustment mechanism, can flexibly adjust the number of spring modules used according to different loads, thereby reducing usage and increasing overall lifespan. At the same time, it can quickly determine the status of the spring module and quickly detect abnormal deformation of spring 15, thus facilitating timely maintenance and avoiding load control failure; a detailed description will follow.

[0030] Furthermore, the side wall of the spring cylinder 11 is provided with an axial groove 112 and a plurality of circumferential grooves 113; the axial groove 112 and the circumferential grooves 113 are fixedly connected in the middle; when the spring 15 is not under force, the T-shaped block 333 is located on the circumferential groove 113.

[0031] Because multiple spring modules are connected in series, the controllable torque is related to the number of modules connected in series. When spring 15 is not under force, T-block 333 is located on the circumferential groove 113. Since T-block 333 slides in the T-shaped arc groove 332, it can be selectively slid to the edge of the circumferential groove 113 according to different load sizes, thus limiting the adjustment plate 33. In this way, during load control, only the spring modules between the adjustment plate 33 and the cylinder module are compressed, which can meet the spring 15 requirements for different loads and allow some spring modules to remain uncompressed and in a standby state. This reduces the use of some spring modules and improves the overall lifespan. At the same time, when some spring modules deform abnormally, the length of the spring module when it is not compressed will change, so the corresponding T-block 333 will not be on the circumferential groove 113. This allows for quick judgment of the spring module status and quick detection of abnormal deformation of spring 15, facilitating timely maintenance and preventing load control failure.

[0032] Furthermore, a third sliding hole 121 is provided on the spring seat 12, and the third sliding hole 121 is slidably connected to the guide tube 17; a through hole is provided in the middle of the spring seat 12, and a connector 14 is inserted into the through hole, and the other end of the connector 14 is locked to the spring seat 12 by a nut 13; a threaded groove is provided on the connector 14 and is threadedly connected to the piston rod 6 of the cylinder module.

[0033] The piston rod 6 is screwed into the threaded groove of the connector 14 on the spring seat 12 to facilitate the installation and disassembly of each module.

[0034] Furthermore, the piston 9 is connected to the piston rod 6 via a dividing ring 10; two O-rings 23 are provided on the side wall of the piston 9 for sealing the piston 9 and the cylinder 8; a guide ring 22 is fixedly provided on the side wall of the piston 9 to guide the movement of the piston 9 relative to the cylinder 8; an oil reservoir 24 is provided on the side wall of the piston 9 between the two O-rings 23; and a second guide ring 21 is fixedly provided on the inner wall of the third sliding hole 121.

[0035] The guide ring 22 and the second guide ring 21 provide guidance, while the oil reservoir 24 is used for lubrication to extend the service life of the guide ring.

[0036] Furthermore, the flange at one end of the cylinder connecting cover 7 and the cylinder 8 are connected by screws, and the flange at the other end of the cylinder 8 and the spring sleeve 11 are connected by screws; two second O-rings 25 are provided between the piston rod 6 and the cylinder connecting cover 7 for sealing; a second oilless bearing 26 is used to guide the piston rod 6 and the cylinder connecting cover 7; a second oil reservoir 27 is also provided on the inner ring wall of the cylinder connecting cover 7 between the two second O-rings 25.

[0037] It is worth noting that the cylinder module is a mature existing technology. It controls the movement of piston 9 through pneumatic control, thereby performing the execution control. It will not be described in detail here.

[0038] Furthermore, a second through hole is provided on the cylinder connecting cover 7, and a second nut 28 is fixed on the second through hole. A limit screw 29 is screwed onto the second nut 28 to limit the stroke of the piston 9. A washer 31 and a third O-ring 30 are fixed on one end of the second nut 28.

[0039] By rotating the limiting screw 29, the contact between the end of the limiting screw 29 and the piston 9 is controlled, thereby adjusting the stroke range, which is suitable for different load adjustments.

[0040] Furthermore, a third guide ring 18 is provided inside the first sliding hole 161; a pressure cap 20 is fixedly connected to one end of the spring cylinder 11 away from the end cap 111 via a positioning ring 19.

[0041] It is worth emphasizing that, based on the different deflection angles of the two slots of the shift fork, they are divided into symmetrical double shift fork housings and offset double shift fork housings, such as... Figure 2 As shown; the symmetrical double fork housing is suitable for ball valves, while the offset double fork housing is suitable for butterfly valves. The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A single-acting pneumatic actuator with ultra-high torque, characterized in that, The system includes a spring module, a cylinder module, and a housing module. The housing module includes a housing (1) and a shift fork (2). Two guide rods (5) are symmetrically fixed inside the housing (1). A guide block (4) is slidably connected to the guide rod (5) via an oil-free bearing. A transmission pin (3) is rotatably connected to the guide block (4) via an oil-free bearing. A push groove is symmetrically opened through the shift fork (2), and the transmission pin (3) is located inside the push groove. An external load is connected to the middle of the shift fork (2). Both guide blocks (4) are connected to piston rods (6). One end of the piston rod (6) is fixedly connected to the piston (9) of the cylinder module. The two cylinder modules are located on both sides of the housing module. A spring module is fixedly connected to the piston (9) of the cylinder module for resetting.

2. The single-acting pneumatic actuator with ultra-high torque according to claim 1, characterized in that, The spring module includes a spring cylinder (11), one end of which is detachably fitted with an end cap (111); four guide tubes (17) are evenly arranged circumferentially inside the spring cylinder (11); one end of the guide tube (17) is fixedly connected to the end cap (111); multiple spring modules are fitted on the guide tube (17); the spring modules away from the end cap (111) are fixedly connected to a spring seat (12), and the spring seat (12) is fixedly connected to the piston (9) of the cylinder module.

3. The single-acting pneumatic actuator with ultra-high torque according to claim 2, characterized in that, The spring module includes a spring spacer (16) that is slidably connected to the inner wall of the spring cylinder (11); a first sliding hole (161) is provided through the spring spacer (16), and the first sliding hole (161) is slidably connected to the guide tube (17); springs (15) are fixedly connected to both ends of the first sliding hole (161), and the two springs (15) have opposite directions of rotation; the adjacent springs (15) on the same side of the spring spacer (16) have opposite directions of rotation; the springs (15) are all sleeved on the guide tube (17); the springs (15) at the near end of the adjacent spring modules have opposite directions of rotation.

4. The single-acting pneumatic actuator with ultra-high torque according to claim 3, characterized in that, An adjustment mechanism is provided between adjacent spring modules. The adjustment mechanism includes an adjustment disk (33). A second sliding hole (331) is provided on the adjustment disk (33). The second sliding hole (331) is slidably connected to the guide tube (17). The two ends of the second sliding hole (331) are respectively fixedly connected to the corresponding spring (15). A T-shaped arc groove (332) is provided on the side wall of the adjustment disk (33). A T-shaped block (333) is slidably connected on the T-shaped arc groove (332).

5. The single-acting pneumatic actuator with ultra-high torque according to claim 4, characterized in that, The side wall of the spring cylinder (11) has an axial groove (112) and multiple circumferential grooves (113); the axial groove (112) and the circumferential groove (113) are fixedly connected in the middle; when the spring (15) is not under force, the T-block (333) is located on the circumferential groove (113).

6. The single-acting pneumatic actuator with ultra-high torque according to claim 2, characterized in that, The spring seat (12) is provided with a third sliding hole (121), which is slidably connected to the guide tube (17); the spring seat (12) is provided with a through hole in the middle, and a connector (14) is inserted into the through hole. The other end of the connector (14) is locked to the spring seat (12) by a nut (13); the connector (14) is provided with a threaded groove and is threadedly connected to the piston rod (6) of the cylinder module.

7. The single-acting pneumatic actuator with ultra-high torque according to claim 6, characterized in that, The piston (9) is connected to the piston rod (6) via a dividing ring (10); two O-rings (23) are provided on the side wall of the piston (9) for sealing the piston (9) and the cylinder (8); a guide ring (22) is fixedly provided on the side wall of the piston (9) to provide guidance for the movement of the piston (9) relative to the cylinder (8); an oil reservoir (24) is provided on the side wall of the piston (9) between the two O-rings (23); a second guide ring (21) is fixedly provided on the inner wall of the third sliding hole (121).

8. The single-acting pneumatic actuator with ultra-high torque according to claim 7, characterized in that, The cylinder connecting cover (7) and the flange at one end of the cylinder (8) are connected by screws, and the flange at the other end of the cylinder (8) and the spring sleeve (11) are connected by screws; two second O-rings (25) are provided between the piston rod (6) and the cylinder connecting cover (7) for sealing; a second oilless bearing (26) is used to guide the piston rod (6) and the cylinder connecting cover (7); a second oil reservoir (27) is also provided on the inner ring wall of the cylinder connecting cover (7) between the two second O-rings (25).

9. The single-acting pneumatic actuator with ultra-high torque according to claim 8, characterized in that, A second through hole is provided on the cylinder connecting cover (7), and a second nut (28) is fixed on the second through hole. A limit screw (29) is screwed onto the second nut (28) to limit the stroke of the piston (9). A washer (31) and a third O-ring (30) are fixed on one end of the second nut (28).

10. The single-acting pneumatic actuator with ultra-high torque according to claim 3, characterized in that, A third guide ring (18) is provided inside the first sliding hole (161); a pressure cap (20) is fixedly connected to one end of the spring cylinder (11) away from the end cap (111) via a positioning ring (19).

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